How do I get my iPhone back into my account?

See - Report a lost or stolen Apple product - Apple Support, and also If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support.

Dawnrena78 Said:

"How do I get my iPhone back into my account?: My cousin stole my iPhone 6s it was logged on to my******@icloud How do I report it and get back into my account"

-------

Ask the Parents:

Pretty disrespectful on your cousin's part - have you spoken with their parents? I guess you could always speak to your cousin's parents, and request they retrieve it back.